Boardview for an FL1 mainboard, labelled MB-D, in .bdv format at 552 KB; the name does not reveal brand or exact device. BDV files are opened with boardview tools such as FlexBV or the older TestLink-style viewers and allow searching components, nets and pins. Pair it with the matching FL1 schematics to follow power rails and signals while hunting shorts. Check that the board code on the PCB corresponds to FL1 before trusting part locations.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @vinafix_bios. Enginerys does not host this file.
How to open a .bdv file
Text-based boardview produced by Honhan / Hon Hai test tooling, with lightly obfuscated content.
OpenBoardViewFlexBVBoardViewer